Android Open Source - Swipe-Tabs Zoom Out Slide Transformer

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Back to project page Swipe-Tabs.

License

The source code is released under:

MIT License

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Java Source Code

package it.bellotti.android.swipetabs.transforms;
//  w w  w .  j a  v a2  s.c o  m
import android.view.View;

/**
 * Created with IntelliJ IDEA.
 * User: SimoneBellotti
 * Date: 24/11/2014
 * Time: 13.13
 */

public class ZoomOutSlideTransformer extends BaseTransformer {
    private static final float MIN_SCALE = 0.85f;
    private static final float MIN_ALPHA = 0.5f;

    @Override
    protected void onTransform(View view, float position) {
        if (position >= -1 || position <= 1) {
            // Modify the default slide transition to shrink the page as well
            final float height = view.getHeight();
            final float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
            final float verticalMargin = height * (1 - scaleFactor) / 2;
            final float horizontalMargin = view.getWidth() * (1 - scaleFactor) / 2;
            // Center vertically
            view.setPivotY(0.5f * height);
            if (position < 0) {
                view.setTranslationX(horizontalMargin - verticalMargin / 2);
            } else {
                view.setTranslationX(-horizontalMargin + verticalMargin / 2);
            }
            // Scale the page down (between MIN_SCALE and 1)
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);
            // Fade the page relative to its size.
            view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA));
        }
    }
}

Java Source Code List